CN106770479A - Prepare anisotropic conductive composite solidification process detecting system - Google Patents

Abstract

Prepare anisotropic conductive composite solidification process detecting system the invention discloses one kind, it is characterized in that setting material molds can be heated, and to heat material molds formed externally-applied magnetic field composite solidified cell；Set electrode signal detection unit, multiple electrodes in array distribution on the madial wall of material molds, and with material molds in material formed good contact；Using the electrode signal of Real-time Collection, realtime graphic reconstruct is carried out to the conductivity variations situation in conducing composite material solidification process using Review of Electrical Impedance Tomography, conductive particle distribution in the base is obtained using reconstructed image, and the distribution real-time regulation applied field strengths according to conductive particle in the base, and real-time regulation heating plate heating-up temperature.The present invention makes the conducing composite material for preparing have more accurate electrical characteristics, improve production efficiency, accurate hardening time.

Description

Preparation of anisotropic conductive composite material curing process detection system

technical field

The invention relates to the technical field of detection, in particular to a detection system for the curing process of preparing anisotropic conductive composite materials.

Background technique

In the preparation process of conductive composite materials, there are usually impedance analyzer methods and optical fiber sensor detection methods for the detection of the curing reaction of composite materials, but both have limitations. The impedance analyzer method is expensive, and the high-precision impedance analyzer is very expensive; The optical fiber sensor detection method has a complex structure and many sensors are laid. Both methods cannot display the change of conductivity inside the conductive composite material in real time, lack detailed distribution information of conductive particles, and cannot prepare conductive composite materials with more accurate electrical properties by controlling the magnetic field and heating temperature in real time. Based on the above reasons, it is necessary to improve the equipment in the prior art to improve the electrical performance of the product.

Electrical impedance tomography is a non-destructive imaging technology. According to the different components of the measured substance and the characteristics of different electrical impedance characteristics of the same substance in different states, electrodes are attached to the surface of the object and current is injected to measure the electrode voltage. , and then use the measured voltage data combined with the image reconstruction algorithm to construct a tomographic image based on the internal electrical impedance of the object. However, so far, electrical impedance tomography has not been applied in the detection of high-performance and precise conductive composite materials.

Contents of the invention

The invention provides a detection system for the curing process of preparing anisotropic conductive composite materials, so as to avoid the waste of resources caused by the uncontrollable curing time, magnetic field strength and temperature in the prior art. Detection and control, improve the production efficiency of the preparation of conductive composite materials, save curing time and raw material resources.

The present invention adopts following technical scheme for solving technical problems:

The structural features of the detection system for the curing process of the anisotropic conductive composite material prepared by the present invention are: a composite material curing unit capable of heating the material mold and forming an external magnetic field for the heated material mold; an electrode signal detection unit, a plurality of electrodes Distributed in an array on the inner wall of the material mold, and form good contact with the material in the material mold; according to the electrode signals collected in real time, the electrical impedance imaging technology is used to perform real-time image reconstruction of the conductivity changes during the curing process of the conductive composite material. According to the distribution of conductive particles in the matrix, the strength of the applied magnetic field and the heating temperature of the heating plate can be adjusted in real time according to the distribution of conductive particles in the matrix.

The structural point of the detection system for the curing process of the anisotropic conductive composite material prepared by the present invention also lies in:

The composite material curing unit is formed by a pair of supports on the top surface and the bottom surface to clamp the insulation mold up and down, so that the insulation mold is fixed at the center position; the heating sheet is attached to the top surface and the bottom surface of the insulation mold, Use the heating sheet to heat the material in the insulating mold; two excitation coils are supported by a pair of supports, and are located above and below the insulating mold, and the magnetic field generated by the excitation coil is used as the material in the insulating mold. When the external magnetic field;

A controller is set, which is used to control the current of the excitation coil and the heating temperature of the electric heater; a signal collector is set, which is used to collect electrode signals; a microprocessor is set, which uses the controller to process the electrode signals. Provide control signals for the excitation coil and the electric heater in real time.

The structural point of the detection system for the curing process of the anisotropic conductive composite material prepared by the present invention is also that: a multi-way switch is provided, and the microprocessor uses the multi-way switch to select and collect electrode signals.

The structural point of the detection system for the curing process of the anisotropic conductive composite material in the present invention is also that: the multi-way switch is a high-speed multi-way analog switch connected to each electrode, and the current input of different electrodes is controlled by using different gating states of the multi-way switch Combined pairs and combined pairs for voltage measurement of different electrodes.

The structural point of the detection system for the curing process of the anisotropic conductive composite material in the present invention is also that: when the reconstructed image no longer changes, it is judged that the conductive composite material is solidified and formed.

The structural point of the detection system for the curing process of the anisotropic conductive composite material prepared by the present invention is also that: for the upper support on the top surface of the insulating mold among the supports, the center of the upper support is fixed in a "T" shape There are screw rods, and the pair of supports are fastened by the screw rods.

The structural point of the detection system for the curing process of the anisotropic conductive composite material prepared in the present invention is also that: the heating plate is an insulating and high-temperature-resistant ceramic heating plate.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

The present invention detects the distribution of conductive particles in the matrix during the curing reaction in real time, controls the current of the excitation coil and the heating temperature according to the information provided by image reconstruction, and the prepared conductive composite material has more accurate electrical characteristics, which can effectively avoid The waste of resources caused by the inability to control the curing parameters in real time in existing technologies has effectively improved the production efficiency of the preparation of conductive composite materials and saved curing time and raw material resources.

Description of drawings

Fig. 1 is a schematic structural diagram of the detection system of the present invention;

Fig. 2 shows the distribution information of conductive particles in different states and the schematic reconstruction of the graph.

Numbers in the figure: 1 screw; 2 excitation coil; 3 heating plate; 4 electrode; 5 conductive composite material; 6 insulating mold; 7 support; 8 microprocessor; 9 input device; 10 multi-way switch; 11 signal collector; 12 controllers.

detailed description

The structural form of the detection system for the curing process of preparing anisotropic conductive composite materials in this embodiment is: a composite material curing unit capable of heating the material mold and forming an external magnetic field for the heated material mold is provided; an electrode signal detection unit is provided. Each electrode 4 is distributed in an array on the inner sidewall of the material mold, and forms good contact with the material in the material mold; according to the electrode signal collected in real time, the conductivity change during the curing process of the conductive composite material 5 is analyzed by using electrical impedance imaging technology Carry out real-time image reconstruction, use the reconstructed image to obtain the distribution of conductive particles in the matrix, and adjust the strength of the external magnetic field in real time according to the distribution of conductive particles in the matrix, and adjust the heating temperature of the heating sheet in real time; during the curing process of conductive composite materials In , the voltage signal between the electrodes around the insulating mold is constantly changing, and when the reconstructed image no longer changes, it is judged that the conductive composite material is solidified and formed.

As shown in Figure 1, in the specific implementation, the composite material curing unit is formed by a pair of supports 7 on the top surface and the bottom surface to clamp the insulating mold 6 up and down, so that the insulating mold 6 is fixed on the central position; the heating plate 3. Attach to the top and bottom surfaces of the insulating mold 6, and use the heating plate 3 to heat the material in the insulating mold 6; the two excitation coils 2 are supported by a pair of supports 7, and are located above and below the insulating mold 6. Below, the magnetic field generated by the excitation coil 2 acts as an applied magnetic field when heating the material in the insulating mold 6 .

Controller 12 is set, and it is used to control the electric current size of excitation coil 2, and the heating temperature of control electrothermal sheet 3; Signal collector 11 is set, and it is used for collecting electrode signal; Microprocessor 8 is set, and it is passed to electrode signal For processing, the controller is used to provide control signals for the excitation coil 2 and the electric heating sheet 3 in real time; the heating sheet 3 is an insulating and high-temperature-resistant ceramic heating sheet.

A multi-way switch 10 is set, and the microprocessor 8 utilizes the multi-way switch 10 to strobe and collect electrode signals; the multi-way switch 10 is a high-speed multi-way analog switch connected to each electrode 4, and the different gate states of the multi-way switch 10 are used to control different electrodes The current input combination pair and the voltage measurement combination pair of different electrodes, the input device 9 is used as a man-machine dialogue terminal.

For the upper support on the top surface of the insulating mold in the support, the center of the upper support has a "T"-shaped solid connection with a screw 1, and the screw 1 is used to fasten a pair of supports so that the heating sheet and the insulation The form fits well.

A1, a2, a3 and a4 in Figure 2 are state diagrams of conductive particles, and b1, b2, b3 and b4 in Figure 2 are reconstructed images corresponding to the states shown in a1, a2, a3 and a4; among them, a1 and b1 are in the initial uniform mixing state. As the curing reaction progresses, the position of the conductive particles changes into a chain. Under the action of magnetic field and heating, the cut angle between the chain and the vertical direction changes continuously, and there will be too large cut angle or The case of zero is the intermediate state shown by a2 and b2, and the complete state shown by a3 and b3; it has reached the expected state shown by a4 and b4 through control.

Claims (7)

1. A solidification process detection system for preparing anisotropic conductive composite material is characterized in that: a composite material solidification unit capable of heating the material mould, and forming an external magnetic field to the heated material mould; an electrode signal detection unit is set, and multiple The electrodes are distributed in an array on the inner wall of the material mold, and form good contact with the material in the material mold; according to the real-time collected electrode signals, the electrical impedance imaging technology is used to monitor the conductivity changes during the curing process of the conductive composite material in real time. Image reconstruction, using the reconstructed image to obtain the distribution of conductive particles in the matrix, and adjust the strength of the applied magnetic field in real time according to the distribution of conductive particles in the matrix, and adjust the heating temperature of the heating sheet (3) in real time. 2. preparation anisotropic conductive composite material curing process detection system according to claim 1, is characterized in that: The composite material curing unit is composed of a pair of supports (7) that are placed on the top surface and the bottom surface to clamp the insulating mold (6) up and down, so that the insulating mold (6) is fixed on the central position; the heating plate (3 ) is attached to the top and bottom surfaces of the insulating mold (6), and the heating plate (3) is used to heat the material in the insulating mold (6); the two excitation coils (2) are supported by a pair of supports (7), And be located above and below the insulating mold (6), the magnetic field produced by the excitation coil (2) is used as the external magnetic field when the material in the insulating mold (6) is heated; A controller is set, which is used to control the current size of the excitation coil (2) and the heating temperature of the control electric heater (3); a signal collector is set, which is used to collect electrode signals; a microprocessor is set, which passes the electrode signal The controller is used to provide control signals for the excitation coil (2) and the electric heater (3) in real time. 3. The detection system for the curing process of preparing anisotropic conductive composite material according to claim 2, characterized in that: a multi-way switch is set, and the microprocessor uses the multi-way switch to strobe and collect electrode signals. 4. The curing process detection system for preparing anisotropic conductive composite material according to claim 3, characterized in that: the multi-way switch is a high-speed multi-way analog switch connected to each electrode, and the different gate states of the multi-way switch are utilized Control current input combination pairs of different electrodes and voltage measurement combination pairs of different electrodes. 5. The detection system for curing process of anisotropic conductive composite material according to claim 1, characterized in that: when the reconstructed image no longer changes, it is judged that the conductive composite material is solidified and formed. 6. The curing process detection system for preparing anisotropic conductive composite material according to claim 1, characterized in that: for the upper support on the top surface of the insulating mold in the support, the center of the upper support is in the shape of The "T" type is fixedly connected with a screw rod (1), and a pair of supports are fastened by the screw rod (1). 7. The detection system for curing process of preparing anisotropic conductive composite material according to claim 1, characterized in that: the heating plate (3) is an insulating and high temperature resistant ceramic heating plate.